The contraction of a stressed rectangular plate-like sample
has been investigated considering the mechanical
stability of its two lateral free surfaces with respect to localized perturbation.
The energy variation of the plate
has been calculated to determine the condition of
development of symmetric and non-symmetric wavelet fluctuations
of the two lateral free surfaces when a constant and homogeneous stress is applied to the plate.
The contraction has been then studied when a
source of non-homogeneous strain is embedded into the plate.

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